创建二维数组并赋值解决思路
创建二维数组并赋值
我希望创建一个动态二维数组，第一维是classroom_id(key，课室有多少间不定)，第二维是lesson_id（一节课可能对应多个lesson_id我希望可以做成类似一个头指针后对应一个链表的效果，因为我需要一个一个lesson_id再读取输出，所以符合其他做法也可以），然后不断往里面增加数据，应该怎么办？因为听说PHP没有链表，所以不知道怎么做！
------解决方案--------------------
超过了内存限制。开始处加上：
ini_set ('memory_limit', '128M') //改成你需要的值
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